import java.util.Scanner;

public class Test2_12 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.print("Enter speed and acceleration:");
        int v = sc.nextInt();
        double a = sc.nextDouble();

        // 跑道长度 = (v ^ 2) / (2 * a)
        double length = v * v / (2 * a);
        System.out.println("The minimum runway length for this airplane is "
                + String.format("%.3f", length));

    }
}
